Electric-fuse case.



T. E. MURRAY. ELECTRIC FUSE CAWXSE. APPLICATION FILED SEPT.28,1908.

fat nted Jana 8, 5.909.

QZZ 511 im-O I UNlThll tilliflt.-.

THOMAS E. MURRAYY, OF

NEW YORK, N. Y.

ELEC'EEICFUSE CASE n eeeoes.

Specification of Letters Patent.

Patented 'uno 8,

To all whom it may concern Be it known that I, THOMAS E. MURRAY, citizenof the United States, residing at New York, in the county of New Yorkand State of New York, have invented a certain new and usefulImprovement in Electric-Fuse Cases,'otwhich the following is aspecification.

The invention relates to an electric fuse case or plug, and consists inthe construction were particularly pr ted out in the claim, -ereby theholder containing the fuse is dered removable from the case, and herebyaccess to said holder, when seated in said case, is prevented.

In the accompanying drawings-Figure 1 is a top view of my fuse case.Fig. 2 is a section on the line 1;, w, of Fig. 1, and Fig. 3 is alongitudinal section of the fuse holder.

Similar letters of reference indicate like parts.

The tubular case A is preferably cylindrical and made of porcelain. Itis closed at one end, as shown at B. A portion of the case is threededand covered with the metallic contact sleeve C. Above the sleeve 0 me heo. flange D which rests on the usual soc et in which the case isreceived. In the bore of the case, and on the inner face of the closedend B is a metal contact plate E. A conducting strip F, received in arecess in the side of the bore and in a downwardly inclined passage G inthe case Wall, electrically connects the plate E to the threaded contactsleeve (1.

The fuse and holder, shown separately in Fig. 3, is of knownconstruction, and consists of a preferably porcelain tube H providedWith a inetal cap I, J at each end, to'which ca s the fuse strip K isconnected. The tulle is filled with pulverized magnesia, talc or othershock absorbing non-combustible material. The fuse and holder isinserted in made in the closed end of the case for the her the bore ofthe case A, shown in Ii i that the cap I, at one end of 1 makes contactwith plat trance to the bore is contracted so cap J, at the other end oftightly in theopen n holder is preventec bore when the inse- /V hen thei use case is see-ted in t dicated by dotted lines, Fig. 2, t. end ofcap 5 makes electrical conne the usual contact piste L at l the socket;so that circuit i..- en close cap J through fuse strip rt, plate A Fthreaded sleeve (1, 21.1 so to the socket sleeve M, dotted lines. A holeN nay he the in sertion of a pin conveniently to drive the fuse holderout of the case, when its removal therefrom is desired.

It will be apparent that by this construe tion the fuse and its holderis cornpletelyinclosed in the case A and socket, so that access theretois impossible without removing the case from the socket.

I claim:

A tubular fuse case formed of a single piece of fictile material closedat its upper end and having a circumferential flange, a screw threadedportion below said flange, a threaded metal sleeve on said tnreadedportion, a contact plate within said case and on the closed end thereof,and a conducting strip extending from said plate through the Wall ofsaid case "nelo said flange and se-- cured to said sleeve.

in testimony whereof l have aliixed my signature in presence of twoWitnesses.

THOM 5.8 M EBAY.

Witnesses:

Gnrz'rnnnn T. Pon'rnn, hlAY '1. McGAnRr.

